If baby nurse only one breast, do I need to pump out the other side after every feed?

My baby also drinks only from one side. Initially I did pump the other side. But eventually I stopped and just latched alternately. My breast regulated eventually and I no longer felt engorged. When I returned to work 3 mths ago, I was still able to pump enough and build supply tho. In fact, it worked well for me cos i need not pump every 3 hrs to have enough supply - since my breast regulated to 5-6hrly "refill". (more convenient for me since I cant keep pumping so often in office.)